The Cambridge family is supposed to be heading to Anmer Hall, their Norfolk home, next, so perhaps Her Maj and the DoE will stick around to see their new great-granddaughter over there. In the article linked above you can see that she's sporting one of her most sentimental family brooches, the Flower Basket, also worn to Prince George's christening. I did not realize until this entry that this is our first recorded appearance in 2015 for the Basket - unusual for one that usually ends up on the favorites list at the end of the year.

The Queen's just arrived at church at Sandringham. She is said to be staying privately in the area.